Hey guys, just wondering after how many miles do u change the oil usiing MOBIL 5W-30. Me and my dad change every 10,000 miles, not sure if this is right, but i wanted to know when you guys change yours.
Thanks

10000 milles is way to long, unless your dad uses synthetic oil. In Maine, I'd change it at 3000 milles. VArious viscosity grades do not affect oil change interval. Only if you use synthetic oil, you can wait longer between changes.

Mobil recommends you follow the OEM recommended oil change interval when using M-1. Have you had your used oil analyzed?

The oil we do use is Synthetic, we've done it many times previously. I was just wondering if other people do it also, or am i the only one who does it ?

There's lots of people on this board, including me, who use synthetics. However, by using M-1 for 10K drain intervals ( beyond both Nissan's and Mobil's recommendation) without a UOA, you are doing so blindly.

So then what is the recommendations?

If you want to play it safe, follow the oil change recommendation in your owner's manual. Otherwise, have the oil analyzed and base your decision to extend or not on the results of the analysis.

Why? Intervals for most car makers using regular oil is 7500 miles.

Do a UOA with Blackstone at you next oil change. Without it, everyone on here is guessing. I blindly change mine at 5k using M1, my UOA said I could safely do 6k...so that will be my next change. Another UOA may show I can go to 7k.

I don't think 10k is beyond what you could safely make it. Most car makers have 7500 mile oil changes on regular dino oil. Read here:

http://neptune.spacebears.com/cars/s.../oil-life.html (still going)
http://neptune.spacebears.com/cars/stories/mobil1.html (18k before changing the oil)

State of Maine weather, snow, salty roads, and frequent temperature variations right above and under freezing point, qualifies for severe/intense maintenance schedule,which would be 3750 milles interval.

How does weather, snow, salty roads affect oil?

I can see going to a lighter weight in the winter and a heavier in the summer...but only if the temp is well beyond the limits of 5W-30.

Changing more frequently is a waste, but it certainly won't hurt anything. Mobil states their product may be used for the maximum change interval (mileage or time) specified by the OEM. If extending the drain interval is the goal, why not use a product that is specifically formulated and marketed for extended drains (AMSOIL). At least then you will have the backing of the oil manufacturer if the product is used in accordance with their recommendations. BTW, MA= Massachusetts, but the winter-weather there isn't exactly great either.

When cold, vapor water condensates inside the engine. After startup, condensed water mixes with oil oil. Water corrupts oil. Also, you have to see inside the engine bay of a salt region car. There are white salt stains all over. I can imagine some of this salty air getting inside the air intake, and eventually into the crankcase ventilation system, in contact with the engine oil.

My .02

I guess one wouldn't know for sure until they get their oil actually tested.

Oh another comment. Dont know about the US marketed cars, but the owners manuals of canadian cars have 2 types of maintenance schedules; normal and severe. The severe regime applies to vehicules driven in cold winters, on salty roads, or on dusty roads. The oil change inteerval for this "severe" schedule is 3 months or 3000 milles for most car manufacturers.

Agree. I suppose it's more convenient and economical to just spend $20 on a supplementary oil change.

Interesting. We have severe schedules but usually it is for cars that do a lot of stop and go driving.

I'd get an oil analysis the next time you change your oil, just to see if you can extend your drain interval.

I change oil of my primary car twice a year, regardless how many mile it's been driven. And changing oil once a year for my SUV that only put 3000 miles on it a year. I use M1 5w30 and 10w30 for summer

I think 10,000 is too long in between oil changes. For full synthetic like M1 or Redline 5K-7K is good. Why take a chance with your car having oil that will not protect your engine fully anymore? Is that worth the risk?

There is no risk if a UOA says he can make it that far (and possibly farther).

Reminds me of some hillbillies, no matter if they are fresh clean or muddy dirty, that take a bath twice a year.

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How and where can i do a UOA? (thats getting the oil analyzed right)

ok get your stuff straight MA = Massachusetts; ME = Maine

bump..........
How and where can i do a UOA? (thats getting the oil analyzed right)

Blackstone Labs



*Note the low silicon (good air filtration). I use a drop in K&N.

Ask for the Dyson analysis package too. Worth it's weight in gold, especially if there are any issues.

Took note.

10k miles is kinda long. how many miles is the OEM nissan filter supposed to be good for?